A parking lot intelligent car search system based on visible light and its use method

Abstract

The present invention discloses a parking lot intelligent car search system based on visible light and a method for using the system. The present application relates to the field of positioning technology, and includes a visible light communication module, a central processing unit, and a human-computer interaction interface; the visible light communication module includes a paired transmitting end and a receiving end, the transmitting end includes an electrically connected first single-chip microcomputer, a modulation circuit, and a car headlight, the first single-chip microcomputer solidifies and stores vehicle information, the first single-chip microcomputer controls the car headlight switch through the modulation circuit, and sends out an identification signal in the form of visible light; the receiving end includes an electrically connected photoelectric detector, a conversion circuit, an amplification circuit, a filtering circuit, and a second single-chip microcomputer, the identification signal sent by the transmitting end is converted from an optical signal to an electrical signal through the photoelectric detector and the conversion circuit, amplified by the amplification circuit, filtered by the filtering circuit, and finally demodulated by the second single-chip microcomputer to restore the vehicle information, and communicates with the central processing unit through a serial port.

Description

Technical Field

[0001] The present invention relates to the field of information recognition technology, and in particular to a parking lot intelligent car search system based on visible light and a use method thereof. Background Art

[0002] Various types of parking lots in cities play a vital role in the urban transportation system. The efficiency of parking lot entry and exit will also affect the degree of traffic flow to a certain extent. Its intelligence level indirectly reflects the overall intelligence level of the urban transportation system. Therefore, improving the intelligent management level of parking lots has become an important part of the development of intelligent transportation systems.

[0003] In the prior art, the automatic car search system of indoor parking lots often uses the principle of ultrasound. The Chinese patent "An Intelligent Parking Lot Guidance System and Guidance Method" (application number 202310836776.6) discloses an intelligent parking lot guidance system and guidance method, which uses ultrasonic sensors to identify parking space status and installs cameras in the parking lot for image processing. However, the prior art still has the following problems:

[0004] (1) Ultrasonic equipment is easily affected by environmental noise, and the number of devices needs to be increased to improve recognition accuracy.

[0005] (2) Ultrasonic equipment is only used to identify parking space status and cannot independently process vehicle information.

[0006] (3) When processing vehicle identification information, other means will still be used to assist in identifying vehicle information. The equipment is more complex and the maintenance cost is also higher. Summary of the invention

[0007] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a parking lot intelligent car search system based on visible light and a method of use, so as to solve one or more problems in the prior art.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] A parking lot car search system includes a visible light communication module, a central processing unit, and a human-computer interaction interface. The visible light communication module includes a paired transmitter and a receiver, and the transmitter and the receiver are connected via optical signals. The transmitter is arranged on the car, and includes a first single-chip microcomputer, a modulation circuit, and the headlights of the vehicle itself, which are electrically connected in sequence. The central processing unit is arranged in the parking lot and is electrically connected to a plurality of the receivers. The user communicates with the central processing unit through the human-computer interaction interface. In the above technical solution, the first single-chip microcomputer, the modulation circuit, and the headlight constitute the transmitter, the transmitter outputs signals, the receiver receives signals, and the central processing unit processes signals, thus forming a complete parking lot car search system solution.

[0010] Furthermore, the receiving end is arranged in the parking lot, and includes a photoelectric detector, a conversion circuit, an amplifying circuit, a filtering circuit, and a second single-chip microcomputer which are electrically connected in sequence. In the above technical solution, the optical signal is completely converted into an electrical signal.

[0011] Preferably, the human-computer interaction interface is a QR code and a corresponding web page, and the user scans the code to enter the web page through the wireless network and then interacts with the central processor. In the above technical solution, the QR code is a human-computer interaction method that modern people are more familiar with, and the learning cost is very low.

[0012] Preferably, the photodetector is a PIN diode. In the above technical solution, the photodetector has a relatively simple structure, low cost and simple maintenance.

[0013] The method of use comprises the following steps:

[0014] Step a, modify the lighting circuit of the vehicle, add a first single-chip microcomputer and a modulation circuit between the headlight and the vehicle's lighting control system, the first single-chip microcomputer stores vehicle identification information, including the license plate number and the owner's name and contact information, install a receiving terminal near the parking space in the parking lot and number it, install a central processing unit in the computer room, and install a human-computer interaction interface at multiple fixed points in the parking lot.

[0015] Step b: activating the transmitter after the vehicle is parked in the parking space.

[0016] Step c: After receiving the optical signal, the receiving end converts it into an electrical signal and restores the vehicle identification information, and communicates with the central processor.

[0017] In step d, the central processing unit receives the vehicle identification information and the corresponding receiving end identification information.

[0018] In step e, the user communicates with the central processing unit through the human-computer interaction interface.

[0019] Furthermore, in step a, the first single-chip microcomputer has solidified vehicle identification information, including the license plate number and the owner's name and contact information. The first single-chip microcomputer converts the vehicle identification information into an electrical signal through a modulation circuit, and then converts the electrical signal into an optical signal and transmits it to the receiving end by controlling the switching duration and frequency of the headlights.

[0020] Preferably, in step c, the optical signal received by the receiving end is converted by a photodetector and a conversion circuit, combined with the corresponding receiving end identification information and output as an electrical signal, amplified by an amplifier circuit, filtered by a filter circuit, and finally demodulated by a second single-chip microcomputer to restore the vehicle identification information and the receiving end identification information that transmits the information.

[0021] Preferably, in step e, the information received by the central processor includes vehicle identification information and receiving end identification information. The central processor compares the receiving end identification information with the database to obtain the location of the receiving end, that is, obtains the approximate location of a vehicle with a certain license plate and stores the information.

[0022] Furthermore, the user's location, parking map and payment bill are fixedly displayed in the human-computer interaction interface. The user can enter the license plate number or owner's name of the vehicle to be searched for to display the approximate location of the vehicle and the best route from the user's current location to the vehicle.

[0023] Preferably, the activation signal of the transmitter is a vehicle ignition off signal. Through the above technical solution, users do not need to perform additional operations during the overall use of the parking lot, which improves the user experience

[0024] Compared with the prior art, the beneficial technical effects of the present invention are as follows

[0025] (1) It adopts the visible light communication principle and is suitable for various lighting conditions, especially performs well in low-light environments and is not easily disturbed by environmental factors.

[0026] (ii) Visible light provides higher information bandwidth and data transmission rate, which can not only transmit parking space status but also vehicle information, without the need to install additional vehicle information identification equipment on the parking space.

[0027] (III) Visible light can only travel in a straight line, cannot penetrate walls, and has weak interference, so there is no need to increase the number of receiving ends to improve recognition accuracy. The receiving end only needs to process light signals in a small range and will not receive interfering light signals transmitted from other directions.

[0028] (iv) The receiving end only needs to convert the duration, frequency and other information of the light emitted by the transmitting end into an electrical signal. The data processing is completed by the central processing unit, and with the help of appropriate algorithms, the information contained in the optical signal can be accurately restored, thereby minimizing the operation and maintenance costs of the parking lot.

[0029] (V) The transmitting end includes the headlights of the car itself, and the modification only requires adding the first single-chip microcomputer and the modulation circuit. The vehicle will not suffer irreversible damage and the cost is low.

[0030] (6) The structure is simple and suitable for large-scale promotion. Automobile manufacturers can fine-tune the production line to ship the products with complete transmitter functions, so the promotion and subsequent operation and maintenance costs are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flowchart of the method used in the first embodiment of the present invention.

[0032] Figure 2 It is a structural principle diagram of the transmitting end in the first embodiment of the present invention.

[0033] Figure 3 It is a structural principle diagram of the receiving end in embodiment 1 of the present invention.

[0034] Figure 4 It is a schematic diagram of the human-computer interaction interface in the first embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following is a further detailed description of a parking lot intelligent car search system based on visible light and a method of use proposed by the present invention in combination with the accompanying drawings and specific implementation methods. It is not intended to limit the limiting conditions for the implementation of the present invention, so it has no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0036] Embodiment 1

[0037] like Figures 1 to 4 As shown, the present invention provides a parking lot intelligent car search system based on visible light, including a visible light communication module, a central processing unit and a human-computer interaction interface. The visible light communication module includes a paired transmitting end and a receiving end, and the transmitting end and the receiving end are connected through an optical signal.

[0038] The transmitting end is arranged on the automobile, and is electrically connected to the first single chip microcomputer, the modulation circuit and the headlight of the automobile in sequence. In the above scheme, the function of the transmitting end is realized by utilizing the headlight of the automobile, which reduces the difficulty of modification, reduces the impact on the automobile, makes full use of the components of the automobile, and reduces the phenomenon of functional waste.

[0039] The receiving end is arranged in the parking lot, and includes a photodetector, a conversion circuit, an amplifying circuit, a filtering circuit, and a second single chip microcomputer which are electrically connected in sequence. The photodetector is preferably a PIN diode, which is a mature commercial product with a simple structure and low price, and is suitable for large-scale use.

[0040] The central processor is arranged in the parking lot and is electrically connected to each second single-chip computer, and the user communicates with the central processor through a human-computer interaction interface. In the above scheme, the transmitting end and the receiving end are adapted to realize a complete transmission path of "electrical signal-optical signal-electrical signal-central processor".

[0041] Because visible light transmits more information, while vehicle identification information contains less information, the optical signal required to transmit information is relatively simple. The PIN diode converts the switch, frequency, and power-on duration of the headlight into a simple electrical signal of 0 or 1. After conversion by the conversion circuit, it is combined with the corresponding receiving-end identification information and output as an electrical signal. After amplification by the amplifier circuit and filtering by the filter circuit, it is finally demodulated by the second single-chip microcomputer and restored to the vehicle identification information and the receiving-end identification information that transmits the information. Adding a recognition algorithm on the central processing unit side also further improves the information recognition rate.

[0042] Preferably, the human-computer interaction interface is a QR code and a corresponding web page, and the user scans the code to enter the web page through the wireless network to interact with the central processor. In the above technical solution, the QR code is a very friendly interaction method for new users, without additional learning cost.

[0043] When preparing to leave the parking lot, the user scans the posted QR code, and the current location of the QR code will be displayed on the scanning device. When the user enters his or her vehicle license plate number or the owner's registered name, the vehicle's location, parking time, and fee will be displayed. The central processor will calculate the distance from the QR code to the vehicle's approximate location and the best route, making it easier for users to quickly find their cars in the parking lot.

[0044] The specific working process is as follows:

[0045] Step a, modify the lighting circuit of the vehicle, add a first single-chip microcomputer and a modulation circuit between the headlight and the vehicle's lighting control system, the first single-chip microcomputer stores the vehicle identification information, including the license plate number and the owner's name and contact information, install a receiving terminal near the parking space in the parking lot and number it, install a central processing unit in the machine room, and install a human-computer interaction interface at multiple fixed points in the parking lot. The first single-chip microcomputer converts the vehicle identification information into an electrical signal through the modulation circuit, and then converts the electrical signal into an optical signal and transmits it to the receiving end by controlling the switching duration and frequency of the headlight.

[0046] Step b: activating the transmitter after the vehicle is parked in the parking space. The lighting control of the transmitter is performed after the vehicle is parked in the parking space and the engine is turned off. There is no need for the user to manually operate the switch, and the non-sensing operation improves the user experience.

[0047] Step c, after receiving the optical signal, the receiving end converts it into an electrical signal and restores the vehicle identification information, and communicates with the central processor. The optical signal received by the receiving end is converted by the photodetector and the conversion circuit, combined with the corresponding receiving end identification information and output as an electrical signal, amplified by the amplifier circuit, filtered by the filter circuit, and finally demodulated by the second single-chip microcomputer to restore the vehicle identification information and the receiving end identification information that transmits the information.

[0048] In step d, the central processing unit receives the vehicle identification information and the corresponding receiving end identification information.

[0049] Step e: The user communicates with the central processor through the human-computer interaction interface. The information received by the central processor includes vehicle identification information and receiving end identification information. The central processor compares the receiving end identification information with the database to obtain the location of the receiving end, obtains the approximate location of a vehicle with a certain license plate, and stores the information until the vehicle leaves the site.

[0050] Embodiment 2

[0051] The difference between the second embodiment and the first embodiment is that the transmitting end in the second embodiment is composed of the vehicle headlight and the circuit components of the vehicle itself, and the vehicle itself can transmit the optical signal through the headlight without modifying the circuit.

[0052] After years of intelligent development, traditional cars have more single-chip microcomputers and more powerful central processing units, which can meet the needs of the transmitter for light data processing in terms of hardware. The vehicle central processing unit is more efficient and reliable than the single-chip microcomputer, and there is no need to supply power to the first single-chip microcomputer. In addition, it will not conflict with the control circuit of the original light, which can significantly reduce the overall loss of electricity caused by high-frequency switching of lights when sending light signals.

[0053] Compared with the solution in the first embodiment, the solution in the second embodiment does not need to increase the hardware cost or change the production process. The automobile manufacturer only needs to fine-tune the production line to enable the automobile to have the function of emitting optical signals when it leaves the factory, which is almost zero cost. Users will not affect the original factory warranty due to the modification of the vehicle hardware. At the same time, the supporting facilities deployed in the parking lot only need to demodulate the optical signal, the pressure of data processing is relatively small, and the hardware facility cost is relatively low.

[0054] In the second embodiment, the vehicle leaves the parking lot with a part of the parking lot finding system described in the present application. After the automobile manufacturers promote it, the stock of vehicles with this function will increase, which will also drive the construction of supporting facilities in the parking lot, greatly improve the intelligence level of a city's parking system, and alleviate urban traffic problems to a certain extent.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. The parking lot intelligent car search system based on visible light is characterized by: It includes a visible light communication module, a central processing unit and a human-computer interaction interface. The visible light communication module includes a paired transmitting end and a receiving end, and the transmitting end and the receiving end are connected through an optical signal; the transmitting end is arranged on the car, and includes a first single-chip microcomputer, a modulation circuit and the headlights of the vehicle itself which are electrically connected in sequence; the central processing unit is arranged in a parking lot and is electrically connected to a plurality of the receiving ends, and a user communicates with the central processing unit through the human-computer interaction interface.

2. The parking lot car search system according to claim 1, characterized in that: The receiving end is arranged in the parking lot, and comprises a photoelectric detector, a conversion circuit, an amplifying circuit, a filtering circuit, and a second single-chip computer which are electrically connected in sequence.

3. The parking lot car search system according to claim 1, characterized in that: The human-computer interaction interface is a QR code and a corresponding web page. The user scans the code to enter the web page through the wireless network and interacts with the central processor.

4. The parking lot car search system as claimed in claim 2, characterized in that: The photodetector is a PIN diode.

5. A method of use, based on the parking lot car search system according to claim 2, characterized in that: The following steps are involved: Step a, modifying the lighting circuit of the vehicle, adding a first single-chip microcomputer and a modulation circuit between the headlight and the lighting control system of the vehicle, wherein the first single-chip microcomputer stores the vehicle identification information, including the license plate number and the name and contact information of the owner, installing a receiving terminal near the parking space in the parking lot and numbering it, installing a central processing unit in the computer room, and installing a human-computer interaction interface at multiple fixed points in the parking lot; Step b, activating the transmitter after the vehicle is parked in the parking space; Step c, after receiving the optical signal, the receiving end converts it into an electrical signal and restores the vehicle identification information, and communicates with the central processor; Step d, the central processing unit receives the vehicle identification information and the corresponding receiving end identification information; In step e, the user communicates with the central processing unit through the human-computer interaction interface.

6. The method of use according to claim 5, characterized in that: In step a, the first single-chip microcomputer has solidified vehicle identification information. The first single-chip microcomputer converts the vehicle identification information into an electrical signal through a modulation circuit, and then converts the electrical signal into an optical signal and transmits it to the receiving end by controlling the switching duration and frequency of the headlights.

7. The method of use according to claim 5, characterized in that: In step c, the optical signal received by the receiving end is converted by the photodetector and the conversion circuit, combined with the corresponding receiving end identification information and output as an electrical signal, amplified by the amplifier circuit, filtered by the filter circuit, and finally demodulated by the second single-chip microcomputer to restore the vehicle identification information and the receiving end identification information that transmits the information.

8. The method of use according to claim 5, characterized in that: In step e, the information received by the central processor includes vehicle identification information and receiving end identification information. The central processor compares the receiving end identification information with the database to obtain the location of the receiving end, that is, obtains the approximate location of a vehicle with a certain license plate and stores the information.

9. The method of use according to claim 8, characterized in that: The location of the human-computer interaction interface, the parking lot map and the payment bill are fixedly displayed in the human-computer interaction interface. The user enters the license plate number or owner's name of the vehicle to be searched to display the approximate location of the vehicle and the best path from the user's current location to the vehicle.

10. The method of use according to claim 8, characterized in that: The activation signal of the transmitter is the vehicle shutdown signal.

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